// Copyright 2015 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "src/runtime/runtime-utils.h"

#include "src/arguments-inl.h"
#include "src/base/platform/time.h"
#include "src/conversions-inl.h"
#include "src/counters.h"
#include "src/futex-emulation.h"
#include "src/globals.h"
#include "src/objects/heap-object-inl.h"
#include "src/objects/js-array-buffer-inl.h"

// Implement Futex API for SharedArrayBuffers as defined in the
// SharedArrayBuffer draft spec, found here:
// https://github.com/tc39/ecmascript_sharedmem

namespace v8 {
namespace internal {

    RUNTIME_FUNCTION(Runtime_AtomicsNumWaitersForTesting)
    {
        HandleScope scope(isolate);
        DCHECK_EQ(2, args.length());
        CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0);
        CONVERT_SIZE_ARG_CHECKED(index, 1);
        CHECK(!sta->WasDetached());
        CHECK(sta->GetBuffer()->is_shared());
        CHECK_LT(index, NumberToSize(sta->length()));
        CHECK_EQ(sta->type(), kExternalInt32Array);

        Handle<JSArrayBuffer> array_buffer = sta->GetBuffer();
        size_t addr = (index << 2) + sta->byte_offset();

        return FutexEmulation::NumWaitersForTesting(array_buffer, addr);
    }

    RUNTIME_FUNCTION(Runtime_SetAllowAtomicsWait)
    {
        HandleScope scope(isolate);
        DCHECK_EQ(1, args.length());
        CONVERT_BOOLEAN_ARG_CHECKED(set, 0);

        isolate->set_allow_atomics_wait(set);
        return ReadOnlyRoots(isolate).undefined_value();
    }

} // namespace internal
} // namespace v8
